After a long time of waiting for them to add a blocking feature, I finally contacted support and they helped me block an account. All I had to do was give the name of the account or a link to the profile.
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Open up a chat and tell them you want to stop someone from following you.
Once I gave them the account they responded with:
"We'll permanently remove them from your followers list on our end. This also means they won’t be able to follow you in the future or see your profile, please note this change is not reversible, is this ok?"
I said yes and now they cannot follow me. It shouldn't be this difficult/circuitous to block someone but at least its something.